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@with tstesstnft @Hirn-- V.-R. DAVID, F SANDWICH, ASSIGNOR T O HIMSELF AND D. R'. POMEROY, 0F

PLANO', ILLINOIS;` Lenen; Patent No. 78,070, dazed May 19, 186s.

IMPRGVED METHOD DI' INSBBTING ARTIFICIAL TEBTH.

'ro ALL wHoM rr 'MAY Comment:y

VBe it knownthntI, V. R. DAVID, of Sandwich, in the county Vof DeKalb, and Stute of Illinois, have i invented c. new and improved Method of Inserting Artificial Teeth; and I dohereby declare that the following is a.`full, clear, andexact description of'the construction and operation of'the same, reference being had to the annexed drawings, making part of this specification, in which-H Figures 1 and 2 show the artificial teeth in connection with the artificial plate to which they nre attached in perspective. Parts lettered as follows: A, teeth; B, plete; C C, wings ;v 4D D, chambers.

I construct my improvement, as shown by figs. 1 and 2, substantially the same as in 'ordinairy practice by vdentists; 4thev plate B being of rubber, or any suitable' material, except that in ordiunry practice a. diliicultyV arises bythe inability of the wearer to retain the lower 'plete in proper position.v To obviate Lthis I construct my plate in' proper form tov it the. lower jaw, and extend that! portion ofl the plete which lies outside of the jxtw, andv opposite those teeth known as the 'molurs and cuspide or double teeth, in Vthe, form of two `wingscr vianges, as shown nt C C, which, for convenience, I will c all wings. These wings I nllowto extend in nearly a. horizontal position,'in width from one eighth of on ,inch toene half of an inch, or as fur as the size of the mouth will reasonably permit; and from the rem' end Vof the plate, as for forward as the teeth known as the cuspids, they being, when first formed, nextl to the molars, say from one-eighth tc one-fourth of an inch` in thickness, and diminishing in thickness towards the edge, 'so that they may have, when completed, Vnthinbut not sharp edge; I now remove from the 'under side fthese wings ai portion of themnteriel, extending from a' line directly under the .outside of`the molars alud cuspidsto the outside of the wings, to prevent the outside portionof the wings from resting upon the jaw and causing irritation, and to form two"ch ambers under the plate, as shownnt `D D. i i i The operation ot'- my improvement is as follows: Upon closing the-month, every portion of theunder side of the plu-te, except the wings', is made yto press upon the lower jziw, nnd the insides of the cheeks nre pressed Aby the muscles opposite the molars,'aga.inst' the outer edges of the wings C C, thus forming two chambers underneath the wings C C, from which chambers ythe s .ir can be exhausted by the operation of -the mouth, thus formingtwo vacuums underneath Vthe wings. Now, upon opening the mouth, the inside of the cheek. still pressing the edges of thewings C C, and preventing the air from entering the chambers D 1),.the vacuum is retained, and the pressure ofthe atmosphere upon the top of said wings, or upon" the outside ofthe cheeks oppo` site the vacuums, pressing the cheeks against the edge of :md over the tops of the Wings C C, holds` the pluto inn position while the mouth isA open. Now in the' attempt .tolclose the mouth, as'in biting withthe incisore opfront teeth, the posterior portion of the plate is held down upon the lower `inw by the combined pressure of the atmosphere, .and the ilexibleportion of the 'inside of the cheeks upon the topof the 'wings C C, thuspreventing the posterior portionof the plate from being raised by the depression upon th incisors or front teeth,`

and the plate thrown out of position. p

What I'clairn as my invention,4and desire to secure by Letters Patent, is- The wings 03C, constructed substantially es und for the purposes specified.

VfR. DAVID.

Witnesses: l

, GEO. H. WHITcoMn,

E. S. JOHNSON. 

